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Metropolitan Museum of Art - Gallery Images
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Topics: Paintings, Metropolitan Museum of Art, Asia, Paper, Drawings, Ink, Japan, Ink on paper, 18th–19th...
Topics: Photographs, Europe, Albumen silver prints, Metropolitan Museum of Art, 1854–56, printed 1862,...
Metropolitan Museum of Art - Gallery Images
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Topics: Europe, Netherlands, Oil on wood, Paintings, Metropolitan Museum of Art, ca. 1525, Oil paint
Metropolitan Museum of Art - Gallery Images
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Topics: Europe, Canvas, Paintings, Metropolitan Museum of Art, France, Oil on canvas, Oil paint, 1881
Metropolitan Museum of Art - Gallery Images
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Topics: Europe, Netherlands, Oil on wood, Paintings, Metropolitan Museum of Art, probably 1613, Oil paint
Metropolitan Museum of Art - Gallery Images
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Topics: Europe, Prints, Relief prints, Woodcut, Metropolitan Museum of Art, Woodblock prints, 16 March 1504...
Metropolitan Museum of Art - Gallery Images
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Topics: Europe, Canvas, Italy, Paintings, Metropolitan Museum of Art, Oil on canvas, Oil paint
Topics: Europe, Prints, before 1497, Relief prints, Woodcut, Metropolitan Museum of Art, Woodblock prints,...
Metropolitan Museum of Art - Gallery Images
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Topics: North and Central America, United States, Prints, Metropolitan Museum of Art, color lithograph,...
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GeoDIL Images
by Darla Sondrol
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Gypsum crystal with swallowtail twin Description: Gypsum crystals often interpentrate to form what is called a “swallowtail twin.” The vertical crystal shown here is actually composed of two different crystal domains that share common atoms. The top surface has a reentrant angle because of the two different domains. This specimen is 9 cm tall. Collection: University of North Dakota Mineralogy Collection #790. Tech details: 334 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm...
Topics: geology, mineralogy
GeoDIL Images
by Darla Sondrol
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Native bismuth from Tasna, Bolivia Description: Bismuth is a rare ore of the element bismuth. Spectacular samples are sold in rock shops, but they have been artificially regrown to produce interestingly hopper-like specimens. Bismuth is important as an alloy metal and in the electronics field. This specimen is 3 cm across. Location: Bolivia. Near Tasna. Collection: University of North Dakota Mineralogy Collection #25. Tech details: 262 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera;...
Topics: geology, mineralogy
GeoDIL Images
by Darla Sondrol
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Calcite (chalk) from Dover, England Description: When fine grained, calcite is referred to as “chalk.” This sample comes from the famous White Cliffs, near Dover, England. It is 7 cm across. Chronostratigraphy: Cretaceous. Location: England. Near Dover. Dover's White Cliffs. Collection: University of North Dakota Mineralogy Collection #1917. Tech details: 591 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. The Geoscience Digital Image Library (GeoDIL) is...
Topics: geology, mineralogy
GeoDIL Images
by Darla Sondrol
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Hematitic limestone from near Ontario, Wayne County, New York Description: The Furnaceville Limestone is a hematite-bearing limestone that contains many fossils. The presence of fine grained hematite gives it the reddish tinge. In the 18th and early 19th century, this rock served as a source of iron ore. The specimen is 9.5 cm across. Chronostratigraphy: Silurian. Lithostratigraphy: Furnaceville iron ore. Location: USA ▹ New York ▹ Wayne Collection: Ward’s Collection of Classic North...
Topics: geology, mineralogy
GeoDIL Images
by Darla Sondrol
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Chrysocolla Description: Chrysocolla, CuSiO 3 -nH 2 O, (hydrated copper silicate), is a mineraloid, rather than a true mineral. Most of the time it is amorphous, meaning that it does not have a coherent crystalline structure. Chrysocolla is attractive blue-green that provides a unique color to the mineral world. Location: USA ▹ Arizona. Near Miami. Collection: Ward’s Classroom Collection of Gem Minerals #33. Tech details: 407 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF...
Topics: geology, mineralogy
GeoDIL Images
by Twyla Baker
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Hedenbergite syenite, Portland Township, Quebec, Canada Description: This syenite is dominated by alkali feldspar but also contain small amounts of plagioclase and quartz. Hedenbergite, Ca-Fe pyroxene, is located in the dark veins. The specimen is 9.5 cm across. Location: Canada ▹ Quebec ▹ Portland Township Collection: Ward’s Collection of Classic North American Rocks #110. Tech details: 974 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. The Geoscience...
Topics: geology, mineralogy
GeoDIL Images
by Twyla Baker
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Yttrofluorite, (Ca,Y)F 2 , from Hundholman, Norway Description: Most of this specimen is yttrofluorite, (Ca,Y)F 2 , a variety of fluorite in which yttrium has replaced some of the calcium. This specimen is about 7 cm in longest dimension. Location: Norway. Near Hundholman. Collection: University of North Dakota Mineralogy Collection. Tech details: 628 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. The Geoscience Digital Image Library (GeoDIL) is a collection...
Topics: geology, mineralogy
GeoDIL Images
by Twyla Baker
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Hiortdahlite from Langesundfjord, Norway Description: This sample contains mostly quartz (white) and biotite (black). What makes it special is the presence of light brown hiortdahlite. Hiortdahlite has composition (Ca,Na) 3 (Zr,Ti,Y)Si 2 O 7 (O,OH,F) 2 . This specimen is from Langesundfjord, Norway, and is about 7 cm across. Location: Norway. Near Langesundfjord. Collection: University of North Dakota Mineralogy Collection #1363. Tech details: 594 KB. Hand specimen. Fujifilm FinePix S1Pro...
Topics: geology, mineralogy
GeoDIL Images
by Twyla Baker
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Calcite (“Mexican Onyx”) Description: This polished calcite sample is from Tecal, Mexico. It is about 8.5 cm across. Note the round stains caused by “acid tests”. Location: Mexico. Near Tecal. Collection: University of North Dakota Mineralogy Collection #617. Tech details: 831 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. The Geoscience Digital Image Library (GeoDIL) is a collection of Earth science images primarily intended as a teaching and...
Topics: geology, mineralogy
GeoDIL Images
by Twyla Baker
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Selenite Description: Selenite, CaSO 4 •2H 2 O, is a clear generally colorless variety of gypsum. However, this sample is green because of minor amounts of zinc in the mineral. Selenite often shows a pearl-like luster and is described as having a moon-like glow, but in this sepeciment the green color dominates. This sample is 9 cm across. Location: Australia. Mount Gunson. Collection: University of North Dakota Mineralogy Collection. Tech details: 595 KB. Hand specimen. Fujifilm FinePix S1Pro...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Hedenbergite Description: This sample is about 4 cm. The chemical formula for hedenbergite is CaFeSi 2 O 6 . Hedenbergite is a rock forming mineral in several metamorphic rocks. It is also found in some igneous rocks and ore bodies. Hedenbergite is a cousin to diopside. The mineral is named after the Swedish mineralogist, M. A. L. Hedenberg. Collection: University of North Dakota Mineralogy Collection #4007. Tech details: 735 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera. The...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Brucite from Texas, Pennsylvania Description: The light yellowish mineral is brucite from Texas, Pennsylvania. Brucite is Mg(OH)2. Location: USA ▹ Pennsylvania ▹ Lancaster. Near Texas. Collection: University of North Dakota Mineralogy Collection #1908. Tech details: 690 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. The Geoscience Digital Image Library (GeoDIL) is a collection of Earth science images primarily intended as a teaching and learning resource...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Ferrimolybdite on quartz from Mohave County, Arizona Description: The yellow crust is ferrimolybdite, Fe 2 Mo 3 0 12 ·8H 2 0, on brownish quartz. It is a hydrated iron molybdate mineral that occurs in the oxidized zone of molybdenum-bearing deposits. Location: USA ▹ Arizona ▹ Mohave. Near Kingman. Collection: University of North Dakota Mineralogy Collection #539. Tech details: 688 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. The Geoscience Digital...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Minium, Pb 3 O 4 , the from Caballos Mountains Description: Minium (Pb 3 O 4 ), forms when lead minerals are highly oxidized. It often forms as a light or reddish coating on other Pb minerals. However, some specimens are exceptional and boast a bright red color with a high adamantine luster. The most spectacular specimens come from Broken Hill, New South Wales, Australia. Unfortunately, these specimens formed during a mine fire and some mineralogists do not consider them natural. Location: USA...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Chalcedony Description: Chalcedony is a cyptocrystalline (crystals too small to be seen even by a microscope) variety of quartz. These varieties are divided more by character than by color. Chalcedony or agate is divided into innumeral types that have been named for locally common varieties. Collection: University of North Dakota Mineralogy Collection #1636. Tech details: 188 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. The Geoscience Digital Image Library...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Opal Description: Opal is considered a mineraloid because its structure is not truly crystalline. It has chemistry SiO 2 - n H 2 O. The amount of water, 5-10% or greater, is controlled by the temperature of the host rock at the time the opal formed. Opal forms in sedimentary environments and as a secondary mineral in high-silica extrusive rocks. The most striking quality of opal is its ability to refract and reflect specific wavelengths of light, giving it the characteristic “opalescence”....
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Hambergite from Romona, California Description: Hambergite is a rare hydroxy beryllium borate, Be 2 BO 3 (OH). It is found in syenite pegmates. Typical hambergite is colorless or white, not the brown color of this specimen. Transparent golden yellow gem quality samples come from pegmatites in Madagascar. The specimen shown is about 1 cm across. Location: USA ▹ California ▹ San Diego. Near Romona. Collection: University of North Dakota Mineralogy Collection #1101. Tech details: 223 KB. Hand...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Fluoborite from Ludlow, California Description: The purplish mineral is fluoborite, a magnesium borate mineral, Mg 3 (BO 3 )(F,OH) 3 . In this 4 cm wide sample, from a skarn in California, it is associated with calcite and unidentified calc-silicates. Location: USA ▹ California ▹ San Bernadino. Near Ludlow. Collection: University of North Dakota Mineralogy Collection #1119. Tech details: 380 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. The Geoscience...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Quartz from, Guanajuato, Mexico Description: Here we see sandy quartz crystals, SiO 2 (silicon dioxide). These crystals grew into a vug (open space) although it is hard to tell from this photo. This specimen is about 10 cm across. Location: Mexico. Near Guanajuato. Collection: University of North Dakota Mineralogy Collection #669. Tech details: 654 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. The Geoscience Digital Image Library (GeoDIL) is a collection of...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Troostite (willemite), calcite and franklinite from Franklin, New Jersey Description: The pinkish mineral is troostite, a manganese rich variety of willemite, ZnSi 2 O 4 . The white mineral is calcite, CaCO 3 . The black mineral is franklinite, a spinel mineral having general formula ZnFe 2 O 4 . This sample, from the world famous mineral collecting locality in Franklin, New Jersey, is 9 cm across. Location: USA ▹ New Jersey. Near Franklin. Collection: University of North Dakota Mineralogy...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Riebeckite Description: Riebeckite is a member of the amphibole group. It has the chemical formula of Na 2 (Fe,Mg) 3 Fe 2 Si 8 O 22 (OH) 2 . Riebeckite is a common mineral, but is usually not recognized. Its name comes from Emil Riebeck, a famous eighteenth century German explorer and minerologist. This sample is about 6 cm. Location: USA Collection: University of North Dakota Mineralogy Collection #1400. Tech details: 558 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera. The Geoscience...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Tremolite (var. hexagonite) Description: Tremolite is a type of asbestos and a member of the amphibole group. It has the chemical formula of Ca 2 Mg 5 Si 8 O 22 (OH) 2 . Tremolite is an important temperature indicator for petrologists because at high temps, it will covert to diopside. This sample is about 9 cm. Location: USA ▹ New York. Near Gouverneur. Gouverneur Talc Mines. Collection: University of North Dakota Mineralogy Collection #1383. Tech details: 751 KB. Hand specimen. Fujifilm...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Fuchsite Description: Fuchsite is a dark green variety of muscovite. It can have a wonderfully dark emerald green color. It is often found in compact masses with small crystals. The green color is the result of chromium impurities. Muscovite's chemical formula is KAl 2 (AlSi 3 O 10 )(F,OH) 2 . Location: USA ▹ Vermont. Near Rutland. Collection: University of North Dakota Mineralogy Collection #1448. Tech details: 220 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Hydrotalcite from Gouverneur, New York Description: Hydrotalcite, the geenish mineral, is a hydrated magnesium-aluminum carbonate. This specimen comes from the lowlands of the Western Adirondack Mountains (Precambrian) and is 8 cm across. Chronostratigraphy: Precambrian. Geologic province: Grenville. Location: USA ▹ New York. Near Gouverneur. Western Adirondack Mountains. Collection: University of North Dakota Mineralogy Collection #527. Tech details: 645 KB. Hand specimen. Fujifilm FinePix...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Clinozoisite Description: Clinozoisite is a silicate with the chemical formula, Ca 2 Al 3 (SiO 4 ) 3 (OH). It is a largely unstudied mineral. It is named after its resemblance to zoisite and the monoclinic crystal form. This sample is approximately 6 cm. Location: Mexico. Near Sonora. Collection: University of North Dakota Mineralogy Collection #1261. Tech details: 549 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera. The Geoscience Digital Image Library (GeoDIL) is a collection of...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Wightmanite from Crestmore Quarry, Riverside County, California Description: Wightmanite is a hydrated magnesium borate mineral, most notably found in metamorphosed limestone in a quarry at Crestmore, California. Unfortunately that quarry is no longer accessible. This sample is 8 cm across. Location: USA ▹ California ▹ Riverside. Near Crestmore. Collection: University of North Dakota Mineralogy Collection #1112. Tech details: 463 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera;...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Manganophyllite with quartz Description: Manganophyllite is a silicate from the mica group. It is a variaty of biotite that has a consideral amount of manganesse. The chemical formula for manganophyllite is K(Mn,Mg,Al) 2-3 (Al,Si) 4 O 10 (OH) 2 . Location: USA ▹ Minnesota Collection: University of North Dakota Mineralogy Collection #1452. Tech details: 527 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. The Geoscience Digital Image Library (GeoDIL) is a...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Andradite from Delta, Utah Description: This crystal of andradite (Ca-Fe garnet) is about 4 cm across. Euhedral (very well formed) garnet crystals are dodecahedra (12 sided) with rhomb shaped faces. This one is not quite perfect, but the geometry is clear. Location: USA ▹ Utah. Near Delta. Collection: University of North Dakota Mineralogy Collection #1178. Tech details: 266 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. The Geoscience Digital Image Library...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Uvarovite (chrome garnet) from Morelos, Mexico Description: The green mineral is uvarovite (chrome garnet), Cr 3 Al 2 Si 3 O 12 . The garnets are small, < 1 mm in size. The “woody” material they are on is probably anthophyllite. The sample is about 2.5 cm across. Location: Mexico. Near Morelos. Collection: University of North Dakota Mineralogy Collection. Tech details: 205 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. The Geoscience Digital Image...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Quartz (youngite) Description: Youngite is a name applied to a rock composed of mottled pink, white and gray drusy quartz and agate. It is often polished to make showy pieces or jewelry. The most notable source is in the Hartville uplift in eastern Wyoming. Youngite is a fluorescent rock and so can be found in black light displays at many museums. Although specimens are still for sale, the Wyoming location is now closed. This specimen is 24 cm across. Location: USA ▹ Wyoming. Near Guernsey....
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Yoshimuraite with urbanite, feldspar and rhodonite from the Toguchi Mine in Honshu, Japan Description: This sample is fine grained, so individual minerals are hard to pick out. The orangish mineral is yoshimuraite, a complex barium-strontium-manganese-titanium-iron silicate that also contains phosphate and sulfate. Yoshimuraite is found exclusively in metamorphosed manganese deposits. The black mineral is urbanite, a pyroxene related to augite. The pink mineral is rhodonite. White feldspar is...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Opal Description: Opal is a mineraloid because its structure is not truly crystalline. Opal's chemistry is SiO 2 -nH 2 O. The amount of water in opal varies from 5-10% and greater. This water can help geologists determine the temperature of the host rock at the time the opal formed. Opal's environment is sedimentary and secondary from the alteration of high silica igneous extrusive rocks. The most striking quality of opal is its ability to refract and reflect specific wavelengths of light or...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Azurite with limonite Description: Azurite (the blue mineral) is a carbonate with composition Cu 3 (CO 3 ) 2 (OH) 2 . Here it is accompanied by rusty orange limonite (a mixture of Fe-hydroxides). Although this sample is drab, azurite, an important copper ore mineral, sometimes is found as spectacular showy samples. This sample is about 7.5 cm across. Location: USA ▹ Utah ▹ Toele County Collection: University of North Dakota Mineralogy Collection #682. Tech details: 214 KB. Hand specimen....
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Azurite-malachite Description: Azurite, Cu 3 (CO 3 ) 2 (OH) 2 , owes its name to its azure-blue color. It usually occurs with green malachite, Cu 2 (CO 3 )(OH) 2 . The two minerals often occur mixed together (this sample), forming what is called “azure-malachite” in the gem and mineral trades. Azurite and malachite are both valuable copper ore minerals. This specimen is 5 cm across. Collection: University of North Dakota Mineralogy Collection #1773. Tech details: 271 KB. Hand specimen....
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Chrysoprase Description: Chrysophrase is the apple-green variaty of chalcedony. Chalcedony is a cyptocrystalline (crystals too small to be seen even by a microscope) variety of quartz. These varieties are divided more by character than by color. Chalcedony or agate is divided into innumeral types that have been named for locally common varieties. Chrysoprase is most often mistakan as a variaty of jade. Location: Australia ▹ Queensland Collection: University of North Dakota Mineralogy...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Iodarygite from the Tintic Mine, Utah Description: Iodargyite aka iodyrite is a silver halide with the chemical composition AgI. This sample, 3.5 cm across, has a deep brown-yellow color, but many other colorations are possible. Iodargyrite occurs as a secondary mineral in oxidized zone of arid silver ore deposits. It is named after its chemical composition of iodine, the Greek iodes meaning “violet” and silver, the Latin argentum. Location: USA ▹ Utah. Near Dividend. Tintic Standard...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Chalcotrichite from Ray, Arizona Description: Chalcotrichite, Cu 2 O, is a variety of cuprite. Here it exists in red veins in a hydrothermally altered rock from Ray, Arizona. This sample is 6 cm in longest dimension. Location: USA ▹ Arizona. Near Ray. Collection: University of North Dakota Mineralogy Collection. Tech details: 403 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. The Geoscience Digital Image Library (GeoDIL) is a collection of Earth science...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Tin ore from Cornwall, England Description: In the UND mineral collection, this sample is labeled varlamoffite which is a name for a mineral of composition (Sn,Fe)(O,OH) 2 . It appears, however, much like cassiterite, SnO 2 . Location: England ▹ Cornwall Collection: University of North Dakota Mineralogy Collection. Tech details: 373 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. The Geoscience Digital Image Library (GeoDIL) is a collection of Earth science...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Quartz Description: Quartz, SiO 2 , is one of the most common minerals on earth. This sample has the form of a double-terminated prism. It is about 5 cm long. Location: USA ▹ Colorado. Near Cripple Creek. Collection: University of North Dakota Mineralogy Collection #1593. Tech details: 117 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. The Geoscience Digital Image Library (GeoDIL) is a collection of Earth science images primarily intended as a teaching and...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Scheelite with quartz from Chaffe County in Colorado Description: This specimen, about 5 cm across, contains green scheelite and brownish quartz. Scheelite is calcium tungstate, CaWO 4 . The sample is from Chaffe County, Colorado. The scratches on the surface are from mineralogy students checking hardness. Location: USA ▹ Colorado ▹ Chaffe Collection: University of North Dakota Mineralogy Collection #907. Tech details: 723 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF...
Topics: geology, mineralogy
GeoDIL Images
by Nessa Eull
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Flint, from near Dover, England Description: This is a sample of flint from near Dover, England. Flint is a dark variety of chert. It is mined from layers and seams in chalk units, including the famous White Cliffs of Dover. Early peoples used it to fashion arrow heads and cutting tools, and flint artifacts are found in many places. Near where Dover Castle is today, Romans built a 80 feet high flint lighthouse on the remains of an iron age fort. This sample is 9 cm across. Chronostratigraphy:...
Topics: geology, mineralogy
GeoDIL Images
by Nessa Eull
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Apatite and fluorite Description: Fluorite, CaF s , comes in many colors, but this purplish hue is perhaps most common. Crystals are typically cubic, like the ones shown here. In this specimen, 8 cm across, fluorite cubes are embedded in apatite, Ca 5 (PO 4 ) 3 (OH,F,Cl), the most common phosphate mineral. Collection: University of North Dakota Mineralogy Collection #992. Tech details: 862 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. The Geoscience Digital...
Topics: geology, mineralogy
GeoDIL Images
by Joseph Hartman
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Rhyolite Porphyry, Chafee County, Colorado Description: This specimen is a gray, porphyritic rock, somewhat vesicular, with prominent phenocrysts of smoky quartz averaging 5mm in width and subhedral to euhedral phenocrysts of glassy feldspar averaging 4mm in length. Tiny garnet and topaz crystals occur in some vesicles. The sample is 11 cm wide. Chronostratigraphy: Tertiary. Location: USA ▹ Colorado ▹ Chafee Collection: Ward’s Collection of Classic North American Rocks #12. Tech details:...
Topics: geology, mineralogy
GeoDIL Images
by Darla Sondrol
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Smithsonite from Zacatecas, Mexico Description: Most of this specimen is light greenish smithsonite. Smithsonite is essentially zinc carbonate, but the zinc is usually partially replaced with other elements. This is responsible for the great color variation this mineral exhibits. The light green color of the sample shown here is not unusual. Copper, however, can cause smithsonite to be darker green to blue; cobalt makes it pink to purple; cadmium makes it yellow; and iron makes it brown to...
Topics: geology, mineralogy
GeoDIL Images
by Darla Sondrol
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Siderite in cryolite, from Ivigtut, Greenland Description: This sample contains brown siderite, FeCO 3 , in white cryolite. Siderite is a rhombohedral carbonate related to calcite, but containing iron instead of calcium. Cryolite, Na 3 AlF 6 , is an uncommon mineral. The only place it is found in large quantity is on the west coast of Greenland. This sample is 9 cm in longest dimension. Location: Greenland. Near Ivigtut. Collection: University of North Dakota Mineralogy Collection #702. Tech...
Topics: geology, mineralogy
GeoDIL Images
by Darla Sondrol
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Rhodochrosite with fluorite from Park Co., Colorado Description: Rhodochrosite, (manganese carbonate) MnCO 3 , is a member of the calcite group. Here we see salmon colored rhodochrosite with greenish fluorite, CaF 2 . This specimen is 8 cm in longest dimension. Location: USA ▹ Colorado ▹ Park County. Near Alma. Collection: University of North Dakota Mineralogy Collection #710. Tech details: 151 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. The...
Topics: geology, mineralogy
GeoDIL Images
by Darla Sondrol
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Yellow gypsum Description: This sample of gypsum, CaSO 4 •2H 2 O, is part fibrous (satin spar) and part massive. It is about 4.5 cm high and has unusual color. Collection: University of North Dakota Mineralogy Collection #792. Tech details: 593 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. The Geoscience Digital Image Library (GeoDIL) is a collection of Earth science images primarily intended as a teaching and learning resource for K-16 educators and...
Topics: geology, mineralogy
GeoDIL Images
by Darla Sondrol
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Salesite Description: Salesite, a rare mineral containing iodine, has the formula Cu(IO 3 )(OH). Here we see salesite (the greenish mineral on the surface of an altered carbonate rich rock). The source of this sample is uncertain, but it comes from Chile, perhaps from the Chuquicamata mining district (one of the few places where salesite is found). This sample is about 8 cm across. Location: Chile ▹ Antofagasta. Near Chuquicamata. Collection: University of North Dakota Mineralogy Collection....
Topics: geology, mineralogy
GeoDIL Images
by Mike Davis
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Hornblende granite, Rockport, Massachusetts Description: This is a typical sample of granite; it contains quartz and K-feldspar with lesser amounts of black biotite and black hornblende. The specimen is is 9.5 cm across. Location: USA ▹ Massachusetts. Near Rockport. Collection: Ward’s Collection of Classic North American Rocks #102. Tech details: 921 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. The Geoscience Digital Image Library (GeoDIL) is a...
Topics: geology, mineralogy
GeoDIL Images
by Mike Davis
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Sodalite syenite, Bancroft, Ontario, Canada Description: Syenite is a type of intrusive igneous rock containing abundant alkali feldspar, and usually minor quartz and plagioclase. One or more mafic minerals, and a number of other interesting minerals including sodalite may be present as well. This specimen contains conspicuous blue sodalite and white-pink K-feldspar. White plagioclase and black biotite are also present but are more difficult to see. This specimen is 8 cm across. Location:...
Topics: geology, mineralogy
GeoDIL Images
by Mike Davis
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Green slate, Pawlet, Vermont Description: This green slate comes from near Pawlet, Vermont. Mineral components cannot be identified in hand specimen, but in thin section quartz, feldspar, chlorite, muscovite and biotite can be seen. This sample is 10 cm across. Location: USA ▹ Vermont ▹ Rutland. Near Pawlet. Collection: Ward’s University Rock Collection #184. Tech details: 784 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera, 60mm Nikon AF micro lens. The Geoscience Digital Image...
Topics: geology, mineralogy
GeoDIL Images
by Mike Davis
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Metabasite, Lowell County, Idaho Description: This rock was labelled a gneiss in the Ward’s Collection of Classic North American Rocks, but shows little of the typical dark and light banding that defines a gneiss. So, we have changed the name and use the term “metabasite” which refers to any metamorphosed mafic rock. The dark green mineral is diopside, the white mineral is plagioclase, and small amounts of hornblende are also present (but not easily seen without a microscope). The sample...
Topics: geology, mineralogy
GeoDIL Images
by Mike Davis
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Potsdam Sandstone (Cambrian), Potsdam, St. Lawrence County, New York Description: This is a fine grained red sandstone from Potsdam, New York. The specimen is about 11 cm across. Chronostratigraphy: Cambrian. Lithostratigraphy: Potsdam Sandstone. Location: USA ▹ New York ▹ St. Lawrence. Near Potsdam. Collection: Ward’s Collection of Classic North American Rocks #46. Tech details: 1.27 MB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. The Geoscience...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Citrine Description: Citrine is the yellow orange variety of quartz (SiO 2 ). It is rare in nature but can often be obtained by heating the purple variaty of quartz, amethyst. Quartz, one of the most abundant minerals on Earth, is found in nearly every geological environment, and has many different varieties. Varieties include citrine, amethyst, rose quartz, milky quartz, smoky quartz and others. Collection: University of North Dakota Mineralogy Collection. Tech details: 456 KB. Hand specimen....
Topics: geology, mineralogy
GeoDIL Images
by Dexter Perkins
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Petroglyph on basalt in Albquerque, New Mexico Description: Petroglyph National Monument is really an urban park, stretching about 15 miles along the west side of Albuquerque, New Mexico. It is famous for its impressive collection of ancient Indian and Hispanic rock art on weathered brown basalt. In some places the rock art is mixed with modern graffiti. Location: USA ▹ New Mexico. Near Albuquerque. Collection: E41111991V. Tech details: 454 KB. Vista. Canon Eos Rebel, 55 mm lens, Fuji Provia...
Topics: geology, mineralogy
GeoDIL Images
by Joseph Hartman
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UND Hawaii Spring Break 2002 Description: Joe Hartman's retirement plan. Found in Honolulu on Oahu. Location: USA ▹ Hawaii. Near Honolulu. Waikiki Beach, Oahu. Collection: Joseph Hartman C9356. Tech details: 525 KB. Kodachrome, TIFF. The Geoscience Digital Image Library (GeoDIL) is a collection of Earth science images primarily intended as a teaching and learning resource for K-16 educators and students. This project was initiated at the University of North Dakota (UND) in fall 2000. Dexter...
Topics: geology, mineralogy
GeoDIL Images
by Joseph Hartman
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Trachyte porphyry (Bostonite), Essex County, New York Description: This intrusive igneous rock is a reddish brown, felsitic rock with small feldspar phenocrysts (sodic orthoclase) in a matrix of feldspar and minor amounts of highly altered mafic minerals. The matrix feldspar is stained red by hematite. It sample is about 10 cm across. Chronostratigraphy: Post-Ordovician. Location: USA ▹ New York ▹ Essex. Near Essex. Collection: Ward’s Collection of Classic North American Rocks #15. Tech...
Topics: geology, mineralogy
GeoDIL Images
by Darla Sondrol
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Leightonite, Chuquicamata, Chile Description: The green mineral is leightonite, K 2 Ca 2 Cu(SO 4 ) 4 ·2H 2 O, from Chuquicamata, Chile. Chuquicamata, the world's largest open pit mine, was first mined in pre-Hispanic times. Besides copper, it is a source of many fine mineral specimens. This specimen is about 5 cm across. Location: Chile ▹ Antofagasta. Near Chuquicamata. Collection: University of North Dakota Mineralogy Collection. Tech details: 373 KB. Hand specimen. Fujifilm FinePix S1Pro...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Thorite in pegmatite, Grafton, New Hampshire Description: Thorite, the most common thorium mineral, has formula (Th,U)SiO 4 . This sample, contains typical brown-black thorite and a yellow-orange variety sometimes termed orangite. It is about 4.5 cm across. Location: USA ▹ New Hampshire ▹ Grafton. Near Grafton. Collection: University of North Dakota Mineralogy Collection #1193. Tech details: 448 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. The...
Topics: geology, mineralogy
GeoDIL Images
by Darla Sondrol
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Quartz, jasper Description: Jasper is a variety of chert, which is the general term applied to granular cryptocrystalline quartz (SiO 2 ) varieties. It is thought to form by the replacement of calcareous rock by silica-rich solutions and by direct marine precipitation of silica gel or organic silica. Jasper is commonly associated with interbedded hematite ore deposits of Precambrian age. Location: USA ▹ Arizona. Near Cave Creek. Collection: Ward’s Classroom Collection of Gem Minerals #15....
Topics: geology, mineralogy
GeoDIL Images
by Darla Sondrol
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Quartz, tiger eye Description: Tiger Eye quartz, SiO 2 (silicon dioxide), contains brown iron that produces its golden-yellow color. Cabochon cut stones of this variety show the chatoyancy (small ray of light on the surface) that resembles the feline eye of a tiger. Location: South Africa. Near Griqualand. Collection: Ward’s Classroom Collection of Gem Minerals #16. Tech details: 514 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. The Geoscience Digital...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Topaz from Topaz Mountain, Utah Description: Topaz is a common gemstone, sometimes confused with citrine. Chemically, it is an aluminum silicate fluoride hydroxide, Al 2 SiO 4 (F,OH) 3 . The crystals in this photo come from Topaz Mountain, in the Thomas Range, Utah. They are in a light gray to white rhyolite, some of which can be seen in the photo (attached to the largest crystal). Topaz Valley, the main topaz collecting area, was set aside by the Bureau of Land Management as a rockhound area....
Topics: geology, mineralogy
GeoDIL Images
by Darla Sondrol
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Malachite Description: Malachite, Cu 2 (CO 3 )(OH) 2 (copper carbonate hydroxide), is a famous and very popular semi-precious stone. It is named for the Greek word for “mallow”, a green herb. The light and dark green bands are so distictive that malachite maybe one of the most easily recognized minerals by the general public. Location: Zaire ▹ Katanga District Collection: Ward’s Classroom Collection of Gem Minerals #32. Tech details: 523 KB. Hand specimen. Fujifilm FinePix S1Pro digital...
Topics: geology, mineralogy
GeoDIL Images
by Darla Sondrol
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Berea Sandstone, Cuyahoga County, Ohio Description: This fine grained sandstone is sample #45 from the Ward’s Collection of Classic North American Rocks. Quartz is the dominant mineral. Chert, feldspar, zircon, tourmaline, muscovite, pyrite, and hematite are also present but generally cannot be seen without a microscope. The sample is 10.5 cm across. Chronostratigraphy: Mississippian. Lithostratigraphy: Berea Sandstone (Berea Grit). Location: USA ▹ Ohio ▹ Cuyahoga. Near Berea. Collection:...
Topics: geology, mineralogy
GeoDIL Images
by Shannon Heinle
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Nontronite Description: Nontronite is a sodium ferric-iron silicate hydroxide hydrate mineral of the clay group. Nontronites chemical formula is Na 0.3 Fe+++2(Si,Al) 4 O 10 (OH) 2 ·n(H 2 O). It is named after its locality in Nontrone, Dordogne, France. Location: USA ▹ North Dakota. Near Hazen. Collection: University of North Dakota Mineralogy Collection #1479. Tech details: 335 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. The Geoscience Digital Image...
Topics: geology, mineralogy